
/****************************************************************************** 
 * 
 *  file:  XorHandler.h
 * 
 *  Copyright (c) 2003, Michael E. Smoot .
 *  Copyright (c) 2004, Michael E. Smoot, Daniel Aarno.
 *  All rights reverved.
 * 
 *  See the file COPYING in the top directory of this distribution for
 *  more information.
 *  
 *  THE SOFTWARE IS PROVIDED _AS IS_, WITHOUT WARRANTY OF ANY KIND, EXPRESS 
 *  OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
 *  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 *  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
 *  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
 *  DEALINGS IN THE SOFTWARE.  
 *  
 *****************************************************************************/ 

#ifndef TCLAP_XORHANDLER_H
#define TCLAP_XORHANDLER_H

#include "Arg.h"
#include <string>
#include <vector>
#include <algorithm>
#include <iostream>

namespace TCLAP {

/**
 * This class handles lists of Arg's that are to be XOR'd on the command
 * line.  This is used by CmdLine and you shouldn't ever use it.
 */
class XorHandler
{
protected:

  /**
   * The list of of lists of Arg's to be or'd together.
   */
  std::vector< std::vector<Arg*> > _orList;

public:

  /**
   * Constructor.  Does nothing.
   */
  XorHandler( ) {}

  /**
   * Add a list of Arg*'s that will be orred together.
   * \param ors - list of Arg* that will be xor'd.
   */
  void add( std::vector<Arg*>& ors );
      
  /**
   * Checks whether the specified Arg is in one of the xor lists and
   * if it does match one, returns the size of the xor list that the
   * Arg matched.  If the Arg matches, then it also sets the rest of
   * the Arg's in the list. You shouldn't use this.  
   * \param a - The Arg to be checked.
   */
  int check( const Arg* a );

  /**
   * Returns the XOR specific short usage.
   */
  std::string shortUsage();

  /**
   * Prints the XOR specific long usage.
   * \param os - Stream to print to.
   */
  void printLongUsage(std::ostream& os);

  /**
   * Simply checks whether the Arg is contained in one of the arg
   * lists.
   * \param a - The Arg to be checked.
   */
  bool contains( const Arg* a );

  std::vector< std::vector<Arg*> >& getXorList(); 

};


//////////////////////////////////////////////////////////////////////
//BEGIN XOR.cpp
//////////////////////////////////////////////////////////////////////
inline void XorHandler::add( std::vector<Arg*>& ors )
{ 
  _orList.push_back( ors );
}

inline int XorHandler::check( const Arg* a ) 
{
  // iterate over each XOR list
  for ( int i = 0; static_cast<unsigned int>(i) < _orList.size(); i++ )
    {
    // if the XOR list contains the arg..
    ArgVectorIterator ait = std::find( _orList[i].begin(), 
                                       _orList[i].end(), a );
    if ( ait != _orList[i].end() )
      {
      // go through and set each arg that is not a
      for ( ArgVectorIterator it = _orList[i].begin(); 
            it != _orList[i].end(); 
            it++ )  
        if ( a != (*it) )
          (*it)->xorSet();

      // return the number of required args that have now been set
      if ( (*ait)->allowMore() )
        return 0;
      else
        return static_cast<int>(_orList[i].size());
      }
    }

  if ( a->isRequired() )
    return 1;
  else
    return 0;
}

inline bool XorHandler::contains( const Arg* a )
{
  for ( int i = 0; static_cast<unsigned int>(i) < _orList.size(); i++ )
    for ( ArgVectorIterator it = _orList[i].begin(); 
          it != _orList[i].end(); 
          it++ )  
      if ( a == (*it) )
        return true;

  return false;
}

inline std::vector< std::vector<Arg*> >& XorHandler::getXorList() 
{
  return _orList;
}



//////////////////////////////////////////////////////////////////////
//END XOR.cpp
//////////////////////////////////////////////////////////////////////

} //namespace TCLAP

#endif 
